I also have a light olive skintone that tans well in the summer and gets pale in the winter. I never really knew how to pick make up to suit it, but now I'm a make up artist, so I finally know what to pick to suit it.
I'd try a primer or BB cream first. It's a quick and easy way to make skin look glowy. Avon brands are cheap and work well. If you can find a little room in your budget, I'd try Smashbox primer. It makes skin look super glowy, which is nice, since olive skin can look sallow. I'd also consider bronzer.
For make up colours, I love green eyeshadow. I like to pair pale sparkly green eyeshadow with bronze liner just on the top lids. Or try essence eye crayons in jade. Also, purple eyeshadow is beautiful with olive skin.